LG DK867 Service Manual page 20

ELECTRICAL TROUBLESHOOTING GUIDE
A
RESET or power on.
Show LOGO?
YES
Does
Tray move inside
when it is not at closed
position?
YES
B
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Only for training and service purposes
Flash
NO
memory operates
properly?
SDRAM
works properly?
MT1389L
VIDEO outputs
properly?
Have TV
signal output?
Check AV cable
connection to TV set.
Normal
NO
OPEN_SW & CLOSE_
SW signals?
Normal
OPEN & CLOSE
signal?
Normal
FAN_TRAY+ & FAN_
TRAY- signal?
Check the cable connection
between main PCBA and loader.
3-7
NO
between FLASH & MT1389L
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
pins on MT1389L & AM5890S.
YES
NO
amplifying circuit on Motor driver.
YES
Check connection lines
and the FLASH access time
whether is suitable or not.
Check connection lines
between SDRAM & MT1389L
and the SDRAM is damaged.
Check the related circuit of
MT1389L.
Check the filtering and amp
circuit of TV signal.
Check the load OPEN &
CLOSE switch
Check the Tray control IO
Check the Tray control
LGE Internal Use Only